Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1998-07-13
1999-10-26
Chilcot, Richard
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
G01F 158
Patent
active
059707992
ABSTRACT:
To improve both the absolute measurement accuracy and the linearity of the characteristic function and the short-time repeatability of measurements at varying flow velocities, particularly at low flow rates, this electromagnetic flow probe (10) is designed to be immersed in a fluid flowing in a pipe (12), which is to be measured, the direction of immersion being virtually perpendicular to the direction of fluid flow. The probe is further designed to be passed through a hole in a wall of the pipe fluid-tight and comprises a circular cylindrical housing (11) having a predetermined outside diameter adapted to the bore. The front end (14) of the housing extends into the fluid and is closed fluid-tight by a front plate (14") of insulating material in the form of a calotte, which has a radius approximately equal to 1.2 to 1.5 times the outside diameter of the housing. A coil assembly (15) is disposed in the housing for establishing a magnetic field (16) extending through the front plate (14") into the fluid. A coil core (17') is disposed in the housing and made at least partially of soft magnetic material which ends at or near the front plate. A first galvanic electrode (18) and a second galvanic electrode (19) are disposed in the front plate on one of the meridians of the calotte and symmetrically with respect to a vertex of the meridian.
REFERENCES:
patent: 3529591 (1970-09-01), Schuette
patent: 3693439 (1972-09-01), Cushing
patent: 3881350 (1975-05-01), Nosley
patent: 4000648 (1977-01-01), Olson
Griessmann Marcel
Ohle Frank
Chilcot Richard
Endress & Hauser Flowtec AG
Thompson Jewel
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